data_global _amcsd_formula_title 'H11 I N2 O6' loop_ _publ_author_name 'Helmholz L' _journal_name_full 'Journal of the American Chemical Society' _journal_volume 59 _journal_year 1937 _journal_page_first 2036 _journal_page_last 2039 _publ_section_title ; The Crystal Structure of Ammonium Trihydrogen Paraperiodate, (NH4)2 H3 I O6 _cod_database_code 1010098 ; _database_code_amcsd 0017031 _chemical_formula_sum 'N2 I O6' _cell_length_a 6.88 _cell_length_b 6.88 _cell_length_c 11.10 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 120 _cell_volume 455.020 _exptl_crystal_density_diffrn 2.747 _symmetry_space_group_name_H-M 'R -3' loop_ _space_group_symop_operation_xyz 'x,y,z' '2/3+x,1/3+y,1/3+z' '1/3+x,2/3+y,2/3+z' 'y,-x+y,-z' '2/3+y,1/3-x+y,1/3-z' '1/3+y,2/3-x+y,2/3-z' '-x+y,-x,z' '2/3-x+y,1/3-x,1/3+z' '1/3-x+y,2/3-x,2/3+z' '-x,-y,-z' '2/3-x,1/3-y,1/3-z' '1/3-x,2/3-y,2/3-z' '-y,x-y,z' '2/3-y,1/3+x-y,1/3+z' '1/3-y,2/3+x-y,2/3+z' 'x-y,x,-z' '2/3+x-y,1/3+x,1/3-z' '1/3+x-y,2/3+x,2/3-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z N1 0.00000 0.00000 0.34000 I1 0.00000 0.00000 0.00000 O1 0.23200 0.21600 0.10500